<template>
    <div class="pagination">
      <!-- 上 -->
      <button :disabled="pageNo==1" @click="$emit('getPageNo',pageNo-1)" class="move">&lt;上一页</button>
      <button v-if="startNumAndEndNum.start > 1" @click="$emit('getPageNo',1)" class="page">1</button>
      <button v-if="startNumAndEndNum.start > 2" class="point">...</button>
  
      <!-- 中间部分 -->   
      <button class="page" v-for="(page, index) in parseInt(startNumAndEndNum.end)" :key="index" v-show = "page >= startNumAndEndNum.start" :class="{active:isPage(page)}" @click="$emit('getPageNo',page)">{{page}}</button>
      <button v-if="startNumAndEndNum.end < totalPage-1" class="point">...</button>
      <button v-if="startNumAndEndNum.end < totalPage" @click="$emit('getPageNo',totalPage)" class="page">{{totalPage}}</button>
      <button :disabled="pageNo==totalPage" @click="$emit('getPageNo',pageNo+1)" class="move">下一页&gt;</button>
      <!-- <button>共{{ totalPage }}页</button> -->
  
      <!-- <button style="margin-left: 30px">共 {{ total }} 条</button> -->
    </div>
  </template>
  
  <script>
  export default {
    name: "Pagination",
    props: ["pageNo", "pageSize", "total", "continues"],
    //计算属性
    computed: {
      totalPage() {
        return Math.ceil(this.total / this.pageSize);
      },
      startNumAndEndNum() {
        let start = 0,end = 0;
        start = Math.max(1, this.pageNo - Math.floor(this.continues / 2));
        end = Math.min(this.totalPage,this.pageNo + Math.floor(this.continues / 2));
        return {start,end};
      },
    },
    methods:{
      isPage(page){
        return page==this.pageNo;
      }
    }
  };
  </script>
  
  <style lang="less" scoped>
  .pagination {
    text-align: center;
    button {
      margin: 0 5px;
      background-color: #fff;
      color: #606266;
      outline: none;
      border-radius: 2px;
      padding: 0 4px;
      vertical-align: top;
      display: inline-block;
      font-size: 13px;
      min-width: 35.5px;
      height: 28px;
      line-height: 28px;
      cursor: pointer;
      box-sizing: border-box;
      text-align: center;
      border: 0;
  
      &[disabled] {
        color: #c0c4cc;
        cursor: not-allowed;
      }
      &.active {
        cursor: not-allowed;
        background-color: #ec3838;
        color: #fff;
      }
    }
    .point{
      padding: 0;
      margin: 0 -5px;
    }
  }
  .active {
    background: skyblue;
  }
  .move{
    &:hover{
      color: #ec3838;
    }
  }
  .page{
      border: 1px solid #aaa !important;
      border-radius: 5px !important;
      &:hover{
        border: 1px solid #111 !important;
      }
  }
  </style>
  